Check the listing for details. 2PCS 14mm ID 18mm OD 18" Acrylic Pipe Clear. Condition: New. Listed at 17.98 USD. Description:[1.]Please Note : Please select the appropriate size of acrylic pipe, especially the size of inner diameter and outer diameter. Acrylic pipe can be used in water cooling system. It should be noted that the silicone tube insert(prevents kinks) and professional bending tools are required for bending[2.]The acrylic plastic tubing, is in size of : 14mm(9/16-inch) inner dia, 18mm(23/32-inch) outer dia, 45cm/18-inch total length[3.]Round PMMA tube made in PMMA material, durable and long service life; High transparency, high light transmission; Round Tubing has very high impact resistance[4.]Steps of installation:1.Prepare PMMA pipe of an appropriate size ; 2.Cut out the length you want[5.]With high transparency, transparent acrylic tube has strong light transmittance when used in lamps and lanterns.